Locomotive boiler



Aug. 28, 1928.

A. W. BRUCE LOCOMOTIVE BQILER #Shets-Shct 1 Filed Feb. 7, 1927 TOE IAug. 28, 1928.

A. W. BRUCE 'LocoMo'rIvE BOILER 4 Sheets-She, 2

Filed Feb. 1927 .N V m WIT ESSES Aug. 28, 1928.

WITN 53 ES A. W. BRUCE LOCOMOTIVE BOILER Filed. Feb. 1927 4 Sheets-Sheet4 l 'atentecl Aug. 2%, i928.

UNITED STATES ALEBED W. BRUGE, OF NEW YORK, N. Y.

LoooMorrvn BOILER.

Application filed February 7, 1927. Serial No. 166,391.,

present invention is particularly directed to an improvement in theboiler of my patent aforesaid, and comprises a simplification oi thefeed water connections between the firebox. and the barrel sections ofthe boiler, aniniproved.connection of the Water tubes to be steam drum,the provision of a backhead adapted to support the drum with thecapacity of relative movement, and the. embodiment of a readilyinsertible and removable bridge wall at the forward end of thefire'chamber. f l

The improvement claimed is hereinaiter fully set forth. j

In the accompanying drawings: Figure 1 is a vertical longitudinalcentral section through a locomotive boiler embodying my invention, Fig.2, a one-half horizontal, lon gitudinal sectiontllrough the middle planeof the boiler; Fig. 3, a view, halt in rear elevation, and haltinvertical section on line TIL-J11 of Fig. 1; Figs. l, 5 and 6, verticalsections, on the lines IVIV, VV and VI-VI, respectively, of Fig. 1; Fig.7, a vertical longitudinal central section through a locomotive boilerillustrating a structural modification of my invention; Fig. 8, a hori:zontal haltsection thereof; Figs. 9 and 10, vertical transversesections, on the lines IX-IX and XX, respectively, ofFig. 7 5 and Fig.11, a section on the line XIXI of Fig 10. p y

In the practice of my invention, referring descriptively to the specificembodiment thereof which is herein exemplified, the 10- comotive boilercomprises a fire box, A, and a boiler barrel, 13, connected thereto,through which barrel there extends a plurality of the tubes, 1, in theordinary manner, A com bustion chamber, D, is termed in the forwardportion of the firebox. 'Ahollow mud.

ring, 3, is connected to thebottom ends of, andsupports, a plurality ofwater tubes, 10,

1 which are set closely together and form the sidewalls of the firebox,A. The water tubes, 10, are preferably, as shown, staggered at thepoints of their connection to a steam drum, 11, which extendshorizontally and forwardly from the back head, a, into the barrehli,said drum being supported in,[and

passing freely, by a slipjoint,through the outer sheet, 6, of the backhead of the fire box. The staggered disposition of the up per ends ofthe side water tubes, provides additional metal between the receivingapertures in the wall of the drum, and thereby aliords a proper factorofsat'etyior the drum, without necessitating forcing means. e y e y Theback head of the boiler comprises a plurality of water tubes,- 4:,extenlding up additional reinq PATENT OFFICE,

wardly across the back of the firebox, and

an outer sheet, 6, of substantial thickness, the upper portion of whichis riveted to a wrapper sheet, 15, and which issecured, at bottom, tothe mud ring,l The water tubes, 4:, are connected, at their bottom ends,to, and supported by, the transverse rear portion ot the mud ring, and,extendingupr wardly, are secured, at their tops, to the wall or thedrum, 11. A saddle shaped water cooled bridge wall, 9, is supported onthe transverse iorward portion of the mud ring, sa1d bridge wallextending across the fire box, and having water passages, 9 com lmunicating with the mud ring, between the rivets by which it is securedthereto. The bridgewall is preferably secured only to the mud ring, soas to permit it to expand and contract freely, and the transverseforward portion of the mud ring is inclined upwardly toward thelongitudinal centralplane' of the .iire box, so as toprovideroom.iorasuitable feed water connection, 17, of are barrel withthe mud ring. Arch tubes, 12 ,which support a fire brick. arch, 13, aresecured to the bridge wall, through which theybommunicate with the frontof the mud ring, and ex tend upwardly and rearwardly' to thedrum, 11. r

The sides of the combustion chamber, D,

are formed ofwater tubes, 10,whichiorm continuous walls with the watertubes,10, of-the fire box, and confornnjin curvature, with said tubes,above the horizontaln iddle plane of theboiler. The tubes, 10 and 10are, at their tops, connected to the drum, '11, and, at their bottoms,to the mud ring, 3,

connection provides a passage for water from the barrel to theubottomends of the) and to the feed water connectiomxli, lead mg from thebarrel to the mud ring. This water tubes, 10, of fire box, the arch y Iof the firebox, is connected to the barrel, B,

tubes, and the Water tubes of the back head. A wrapper sheet, 15, whichcovers the top and tube sheet, 2, said Wrapper sheet performing thefunction of firmly connecting the fire box to the barrel of the boiler,and

imparting strength and rigidity to the entire structure, and also offorming a housing or casin for the top of the fire box.

Suitable agging or insulating material, l6, isprovidedfbetween theoutside of the I water tubes, 10, 10*, and. the inside of the Wrappersheet, 15, and similar materialis also applied between the back headtubes, i,

and the outer sheet, 6. The forward end ofthe feed water connection, 17,is supported b .the downWardextension, 2, of the tube s eet, 2,which issecuredto the barrel, and

' 4; and, 12, and the drum, 11, are free to expand or contract withinthe rigid structure comprising the barrel," B, the throat sheet, 2,thewrappersheet, 15, and the rear the box sheet,6. The drum, .11, is alsofree to move longitudinallyin' expanding or con traeting, as it hasmerely a snug and supporting fit in the rear sheet, 6. i

the steam space thereof;.a fee Figs. 7 to 11 inclusive illustrate astructural modification, in which the ordinary Waterspace back head,havin inner and outer sheets, 5, and 6, connected y staybolts, 7, isapplied. The bridge Wallbetvveen the Y firelboxand combustion chamber isalso 40 diiferen tufrom that before described, in being formed of firebrick.

Iclaim as my invention and desire to secure by Letters Patent: i V 1 Ina locomotive boiler, the combination of a barrcl; a fire box, comprisinga combustion chamber and a fire chamber; a back head, having a rigidouter sheetiand closing the rearof thefire chamber; a drum, sup ported,and fitting freely, in the back head, and extending forwardly therefrominto the barrel; water. tubes forming the sides of the fire andcombustion chamber; a hollow mud ring, communicating With the Watertubes of thefire chamber; a tube sheet secured to the barrel and closinthe rear of Water communication, leading from the barrel to the mud ringand communicating with the combustion chamberwater tubes; and awrappersheet, secured to the barrel and to the fire box,and performing thefunctions of rigidly connecting said memberstogether, and forminga'housing covering the rooflofthelfire box.

p 2; In alocoinotiveboiler, the combination of a barrel; a fire box,comprisin a combustion chamber and a firecham er; a back head, having arigid outer sheet and closing the. rear of the lire chamber; a drum,supported, and fitting freely, in the back head, and extending forwardlytherefrom into the barrel; Water tubes forming the sides of the fire andcombustion chambers; a hollow mud ring, communicating with the watertubes of the? fire chamber; a water cooled bridge Wall, mounted on themudring and secured rigidly onlythereto, and extending across the firebox, and a Wrapper sheet, secured to the barrel and to the fire box, andperforming the functions of r-igidlycom meeting said members together,and forming a housing covering the roof of the fire box.

in a locomotive boiler, the combination of a barrel; a fire box of sidewater tube construction, comprising a fire chamber and a combustionchamber; anupper drum, into which the watertubesofthe fire box lead,said drum having a supporting engagement with the lire box and beingfree to move relati'velythereto in expansion and contraction;

and a wrappersheet, secured to the barrel and to the tire box, andperformingthe function of rigidly connecting saidmembers together, andforming a housing covering the roof ofthe fire box. t i

4c. In a locomotive boiler, the combination of a barrel; a lire box ofside water tube con struction, comprising a fire chamber and acombustion chamber; a drum extending horizontally through thetops ofsaidchambers, said drum being free to move relatively thereto inexpansion and contraction; a common feed Water connection, leadin fromthe barrel to the side water tubesof lie firebox andcombustion chamber;and a wra per sheet, secured to the barrel and to tie fire box, andperforming the function of rigidly connecting said members together, andforming a housing covering the roof of the fire box.

5. In a locomotive boiler, the combination.

fronrthe barrel to the bridge Walland the lower cylindricalt drumsconnected by side Witt-61' tubes; a" drum,supp0rted, andfittingfreely,in the back head ofthe firejchamber;

a hollow mud ring, Se-

'struction, c'omprising a firechamber and a e combustion chambercomposed of upper and anda Wrapper sheet,rsecured to the barrel andtothe fire box, and performing the funiition of rigidly connecting saidmeinberstoget-her, and forming a housing covering the roof of the firebox.

7. In a locomotive boiler, the combination of a barrel; a firebox ofside Water tube construction, comprising a fire chamberand a combustionchamber; a rear tube sheet, de pending below the bottom of the barrel; a

water connection from the barrel to the Walls of the fire box, supportedby a down- Ward extension of the rear tube sheet; and a Wrapper sheet,secured to the barrel and to the fire box, and performing the functionof rigidly connecting said members together and formlng a houslngcoverlng the-roof o the fire box.

8. In a locomotive boiler, the combination of a barrel; a fire box ofside Water tube con struction, comprising a fire chamber and acombustion chamber; a rear tube sheet, (le

pending below the bottom of the barrel; a

Water connection from the barrel to the, WtllS of the fire box,supported by a down- Ward extension of the rear tube sheet; a

cover, closing a manhole in said connection and permitting accessthereinto; and a Wrapper sheet, secured to the barrel and to the firebox, and performing the function of rlgidly connecting sa d memberstogether,

and forming a housing covering the roof of the fire box. i i

p ALFRED W. BRUCE.

